shader:
FRAG
DCL IN[0].xy, GENERIC[9], PERSPECTIVE
DCL OUT[0], COLOR
DCL SAMP[0]
DCL SVIEW[0], 2D, SINT
DCL CONST[0..3]
DCL TEMP[0], LOCAL
0: MOV TEMP[0].xy, IN[0].xyyy
1: TEX TEMP[0], TEMP[0], SAMP[0], 2D
2: I2F TEMP[0], TEMP[0]
3: MAD TEMP[0], TEMP[0], CONST[0], CONST[1]
4: MAD TEMP[0], TEMP[0], CONST[2], CONST[3]
5: MOV OUT[0], TEMP[0]
6: END

Current output:

GLSL:
#version 140
#extension GL_ARB_shader_bit_encoding : require
smooth in vec4 vso_g9;
out vec4 fsout_c0;
vec4 temp0[1];
uniform uvec4 fsconst0[4];
uniform isampler2D fssamp0;

void main(void)
{
        temp0[0].xy = vec2(((vso_g9.xyyy).xy));
        temp0[0] = vec4(intBitsToFloat(texture(fssamp0,  temp0[0] .xy)));
        temp0[0] = vec4(ivec4(floatBitsToInt(temp0[0])));
        temp0[0] = vec4(( temp0[0]  * uintBitsToFloat(fsconst0[0]) + uintBitsToFloat(fsconst0[1])));
        temp0[0] = vec4(( temp0[0]  * uintBitsToFloat(fsconst0[2]) + uintBitsToFloat(fsconst0[3])));
        fsout_c0 = vec4(( temp0[0] ));
}

Possible GLSL:

GLSL:
#version 140
#extension GL_ARB_shader_bit_encoding : require
smooth in vec4 vso_g9;
out vec4 fsout_c0;
vec4 temp0_0;
ivec4 temp0_1;
uniform uvec4 fsconst0[4];
uniform isampler2D fssamp0;

void main(void)
{
        temp0_0 = vec2(((vso_g9.xyyy).xy));
        temp0_1 = texture(fssamp0,  temp0[0] .xy);
        temp0_0 = vec4(temp0_1);
        temp0_0 = vec4(( temp0_0  * uintBitsToFloat(fsconst0[0]) + uintBitsToFloat(fsconst0[1])));
        temp0_0 = vec4(( temp0_0  * uintBitsToFloat(fsconst0[2]) + uintBitsToFloat(fsconst0[3])));
        fsout_c0 = vec4(( temp0_0 ));
}